Which movement aimed to promote equality and end racial discrimination in the United States?

The Civil Rights Movement is the correct choice because it was specifically focused on promoting equality and ending racial discrimination against African Americans in the United States. This movement sought to challenge the systemic racism entrenched in various aspects of American life, from segregation in public schools to voting rights and employment opportunities.

Key events of the Civil Rights Movement included the Montgomery Bus Boycott, the March on Washington, and the Civil Rights Act of 1964, all of which were pivotal in advocating for equal rights and dismantling discriminatory practices. The movement was characterized by a wide range of strategies including protests, legal challenges, and grassroots organizing, making it a significant and transformative chapter in American history that helped to push for legislative changes aimed at achieving racial equality.

Other movements mentioned in the choices have distinct focuses. The Women's Suffrage Movement aimed at securing voting rights for women, the Environmental Movement addresses issues regarding the environment and conservation, and the Labor Movement focuses on the rights and working conditions of workers. None of these movements directly address racial equality in the same comprehensive way that the Civil Rights Movement does.